Heterogeneous nucleating agents for crystallization of vinylidence chloride–vinyl chloride copolymers

Abstract

Nineteen compounds are described that are effective heterogeneous nucleating agents for the crystallization of poly(vinylidene chloride–vinyl chloride) copolymers containing 7–13% vinyl chloride. Most of the compounds are relatively high-melting organic nitrogen heterocyclics. The more effective ones raise the polymer freezing points about 20–40°C using a prescribed thermal history.